Hydraulic motor



HYDRAULIC MOTOR J. W. BROCKSON Filed March 11, 1940 hikii w m- May 19,1942.

s w m t t A Patented May 19, 1942 HYnRAULIoMo'roR James W. Brockson,Wilmington, DeL, assignor of'one-half to Samuel T. Green, Wilmington,

Del. 4 i

Application March 11, 1940, Serial'No. 323,462

1 Claim. (01. 121- 164) This invention relates to a hydraulic motor,

the general object of the invention being to provide a motor having acylinder, a piston in the cylinder, a pressure chamber and an outletchamber with valve means actuated bythe movement of the piston rod foralternately supplying liquid under pressure from the pressure chamber toone end of the cylinder and connecting the opposite end to the outletchamber.

The invention is mainly designed for use for reciprocating a cutter of amowing machine though it can be used for reciprocating any other member.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure 1 is a vertical sectional view through the motor. 4

Figure 2 is a view looking toward the rear side or" the motor and itsassociated parts.

Figure 3 is a plan view of the motor.

Figure 4 is a perspective view of the double link forming a part of themotor.

As shown in the drawing a motor M is supported on a base 9 and saidmotor includes a lower cylinder 24 containing a piston 25, the rod 26 ofwhich passes through the outer end of the cylinder 24 and is connectedto a bracket 21' attached to the knife or cutting bar of the I movingmachine or other member to be actuated by the motor so that as thepiston 25 is reciprocated the knife or cutting bar or other member isalso reciprocated. A spring 29 is arranged in each end of the cylinder24 and these springs act as shock absorbers for the movements of thepiston. The motor also includes a top chamber 38 into which leads a pipe3| which is connected with a source of liquid under pressure and themotor also includes an intermediate chamber 32 from which leads anexhaust pipe 33 so that this pipe 33 acts to return the oil or otherliquid from the motor back to the supply. A air of conduits or passages34 are formed in the motor and connect the ends of the cham-' ports asshown so that, in one position of the valves the chamber is incommunication with one end of the cylinder 24 to supply fluid underpressure thereto while the other end of the cylinder 24 is connected bythe opposite valve with the chamber 32 so that the fluid being forcedfrom the cylinder by the piston 25 will pass through the lower part ofthe last-mentioned conduit 34 and through its valve 35'into the chamber32 and then will pass from the chamber through the pipe 33 back to thesupply.

The valves 35 are automatically reversed by the reciprocatory movementof the rod 26 in the following manner.

Upwardly extending arms 38 are connected 7 with the valves 35 exteriorlyof the motor and said arms are connected together by a pair of links 39,see Figure 4, and a lever 40 pivoted at its center to. apart of themotor as shown at 4| has its upper end extending between the links 39,stop pins 42 passing through end portions of the links for the upper endof said lever 48. A coiled spring 43 has one end connected with theupper end of the lever 40 and its other end to a bracket 44 on base 9and said bracket 44 which is located in the plane of the pivot 4| sothat the spring will tend to move the'lever 40 and therefore the links39 and the valves 35 after the lever 48 has passed from one position toa position slightly past dead-center or a vertical position so that thespring tends to hold the valves in either the position shown in Figure lor in a position where the valves are reversed from the position shownin Figure 1. A horizontally arranged bar 45 is supported for swingingmovement by the links 46 having their lower ends pivoted to the bar 45and their upper ends pivoted in a part of the motor and said bar 45 isformed with the spaced pins 48 for engaging the lower end of the lever40. A link 49 connects the outer end of the bar 45 with a pivot on thebracket 21 to which the piston rod 28 is connected.

Thus as the piston 25 and the parts attached thereto move outwardly thelink 49 will exert apull upon the bar 45 so that one of the pins 7 48will engage the lower end of the lever 40 so ber 30 with the ends of thecylinder 24 and enlarged portions of the passages are formed at the endsof the chamber 32 for receiving the valves 35 which are formed with theT-shaped that the lever is shifted to a vertical position and then thespring 43 will continue movement of the lever to reverse the valvesthrough means of the links 39. Then as the piston 25 with the partsattached thereto move inwardly the link 49 will move the bar 45 to theleft in Figure 2 so that the pin 48 engaging the lower end of the lever40 will shift the lever 48 to vertical position and then the spring 43will swing the lever over to the opposite position to again reverse thevalves. In this manner the compressed fluid in chamber 30 is caused toimpart a reciprocatory movement to the piston 25 and, therefore, to theknife or cutting bar of the cutting assembly.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to-be understood that changes may be made in the construction andin the combination and arrangement of the several parts provided thatsuch changes fall within the scope of the appended claim.

Having described the invention, what is claimed as new is:

A hydraulic motor comprising a cylinder, an inlet chamber and an outletchamber located between the first chamber and the cylinder and saidmotor having passages therein connecting the ends of the first chamberwith the ends of the outlet chamber and the ends of the cylinder, valvesin the ends of the outlet chamber having T-shaped ports therein which inone position of the valves connect the first chamber with the cylinderand in another position connect the cylinder with the outlet chamber, apiston in the cylinder, an arm connected with each valve and locatedexterior of the motor, a link connecting the arms together, a leverpivoted intermediate'its ends to an exterior part of the motor, stops onthe link for engagement by the upper end of the lever, a spring formoving the lever in either one of its two positions for shifting thevalves, after the lever passes dead center, a sliding bar having stopsthereon for engaging the lower end of the lever and means forreciprocating the bar from the piston to cause the stops thereon toactuate the lever.

JAMES W. BROCKSON.

